66 research outputs found
Preparation of Well-Defined Nanostructures by Crystallization-Driven Self-Assembly of Simple Conjugated Homopolymers
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Œë¬ž (ë°ì¬)-- ììžëíêµ ëíì : ìì°ê³Œíëí ííë¶, 2019. 2. ìµí늌.Self-assembly of block copolymers in solution was well-known for many decades, and various kinds of nanostructures could be formed by the different combinations of core and corona block with many strategies. Owing to easier synthetic process and further device application of the polymer nanostructures, the self-assembly of a homopolymer attracted attention to the polymer self-assembly field.
However, there were few examples using a homopolymer as a building block for the self-assembled nanostructures because of no corona block that could stabilize the nanostructures. Therefore, the thesis demonstrates the development of effective strategies for the preparation of well-defined nanostructures by simple conjugated homopolymers with controlled size by crystallization-driven self-assembly methods and further potential applications of the resulting nanostructures.
Chapter 2 reports the polyacetylene based conjugated homopolymer containing crystalline fluorene and additional phenyl side chains, and its well-defined one-dimensional (1D) nanoribbons by in situ nanoparticlization process. In addition, the width of nanoribbons had a linear relationship with the polymer chain length because the homopolymer chain extended to the perpendicular direction to the nanoribbon. Furthermore, the length of nanoribbons could be precisely controlled by crystallization-driven self-assembly (CDSA) via selfseeding method from one hundred nanometers to several micrometers. This is the first report on both width- and length-controlled 1D nanoribbons by the simple conjugated homopolymer.
Chapter 3 demonstrates the fluorene polyacetylene homopolymer having a bulky triisopropylsilyl (TIPS) groups and its unique two-dimensional (2D) nanosheets. The homopolymer containing TIPS side chains had a low solubility in a solvent, and it formed only aggregated nanostructures. However, sonication of these aggregations formed the seed nanostructures, and the seeds re-assembled to form well-defined square nanosheets having a uniform thickness and narrow length and area dispersities like CDSA process. In addition, the sonicated nanostructures changed to the rectangular nanosheets with linearly increasing aspect ratios by the amount of adding different poor solvent for the homopolymer. This kind of predictable morphological transition was different from the previous polymer self-assembly examples which could not maintain their original nanostructures by changing the solvent. By analyzing the electron diffraction patterns of these 2D nanosheets, the formation of the rectangles was due to the different surface energy and crystallization speed induced by adding different solvent.
In summary, these new conjugated homopolymers and their simple change of the side chains could create the well-defined 1D and 2D nanostructures with morphological control via CDSA method. In addition, these conjugated homopolymers had semiconducting band gaps and fluorescent properties, so it would be possible to use these versatile homopolymers and their unique nanostructures to the optoelectronic device.ì©ì¡ ìììì ëžë¡ ê³µì€í©ì²Žì ìꞰ조늜íìì ìì ë
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ì€í©ì²Žë€ê³Œ 몚ì
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žêµ¬ì¡°ë€ì ì¶í ë€ìí êŽì ì ëë°ìŽì€ìë ìì©í ì ìì ê²ìŽë€.Abstract ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââi
Table of Contents ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââiv
Chapter 1. Introduction
1-1. In situ Nanoparticlization âââââââââââââââââââââââââââââââââââââââââââââââââââââââ2
1-2. Crystallization-Driven Self-Assembly ââââââââââââââââââââââââââââââââââââ4
1-3. Various Nanostructures by Self-Assembly of
Homopolymers ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ7
1-4. Thesis Researchâââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ9
1-5. References âââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ11
Chapter 2. Well-Defined Nanoribbons with Tunable Size via
Crystallization-Driven Self-Assembly of a Conjugated Homopolymer
2-1. Abstract âââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ16
2-2. Introduction ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ17
2-3. Results and Discussion âââââââââââââââââââââââââââââââââââââââââââââââââââââââââ19
2-4. Conclusion ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ51
2-5. Experimental Sectionâââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ52
2-6. Supporting Informationâââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ61
2-7. References âââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ90
Chapter 3. Uniform Two-Dimensional Nanosheets with Tunable Shape
of a Conjugated Homopolymer by Changing Solvents
3-1. Abstract âââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ94
3-2. Introduction ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ95
3-3. Results and Discussion âââââââââââââââââââââââââââââââââââââââââââââââââââââââââ97
3-4. Conclusion ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ123
3-5. Experimental Sectionâââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ124
3-6. Supporting Information âââââââââââââââââââââââââââââââââââââââââââââââââââââââ131
3-7. References âââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ161
Appendix 1. Control of Peptide Assembly through Directional
Interactions
Abstract âââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ165
Introduction ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ166
Results and Discussion ââââââââââââââââââââââââââââââââââââââââââââââââââââââââ167
Conclusion ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ174
Experimental Sectionâââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ175
Supporting Information âââââââââââââââââââââââââââââââââââââââââââââââââââââââ182
References âââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ188
Appendix 2. Water-Soluble Nanostructures of Polynaphthylene Vinylene
Block Copolymers and Their Chemosensor Studies
Abstract âââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ191
Introduction ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ192
Results and Discussion ââââââââââââââââââââââââââââââââââââââââââââââââââââââââ193
Conclusion ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ198
Experimental Sectionâââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ199
References âââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ202
Abstract (Korean) âââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ203Docto
í¹íë°ëª ì ì§ë³Žì± íëšêž°ì€ì êŽí ì°êµ¬
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Œë¬ž(ìì¬)--ììžëíêµ ëíì :ë²í곌 ìë²ì ê³µ,1998.Maste
The Cold War Influence on the Early Internet: The Constitution of IT through International Politics
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Œë¬ž (ìì¬)-- ììžëíêµ ëíì : ì ì¹ìžêµíë¶(ìžêµíì ê³µ), 2013. 2. ê¹ìë°°.ìŽ ì°êµ¬ë êµì 첎ì ì 구조ì êž°ì 첎ê³ì ìížêµ¬ì±ìŽëŒë ìŽë¡ ì ìê°ìì ëì ìŽêž°ì íµì ë ¥ ê· íì ë³íê° ë¯žêµì íµì ëµìŽëŒë 맀ê°ë³ì륌 ê±°ì³ ìŽë»ê² ìŽêž° ìží°ë·ì í¹ì±ì 구ì±íê² ëìëì§ë¥Œ ì¶ì íë€. ê·ž ëìì êµì ì ì¹ìŽë¡ ìì êž°ì ë³ìë ì£Œë¡ ìžì¬ì ìž ë
늜ë³ìë¡ ì·šêžëìŽ ìë ê²ì ë°íŽ ìŽ ì°êµ¬ë ì¢
ìë³ìë¡ì ìží°ë·ìŽëŒë êž°ì 첎ê³ê° êµì ì ì¹ êµ¬ì¡°ì ë³íì ìí¥ì ë°ì 구ì±ëììì ë°íë€.
ìží°ë·ì ì§ë°°ì ê¶ë ¥ìì ë²ìŽë ê°ìžë€ì ìì ë¡ìŽ ìíµì ì¥ìŒë¡ì êž°ë¥íë©° ìŽë€ìê² ìë¡ìŽ ì ì¹ì ë¥ë ¥ê³Œ ì§í©ì íëì ê°ë¥ì±ì ê°ì žë€ì£Œë ëêµ¬ë¡ ìžìëë 겜í¥ìŽ ìë€. ìží°ë·ì íëìšìŽì ìž ìí€í
ì³ê° ë¶ì°ë íí륌 ê°ê³ ììŽ ê°ìžë€ì ìì ë¡ìŽ ìì¬ìíµì ìŽì§ìí€ë ê²ì ì¬ì€ìŽë€. íì§ë§ ëìì ìží°ë·ì ì 첎 ë€ížìí¬ ì첎ë íì€ì ìž ì»€ë®€ëìŒìŽì
ê·ì¹ìž íë¡í ìœì ìíŽì ë§€ì° ì§ì€ì ìž ë°©ììŒë¡ íµì ëë ìŽì€ì ìž êµ¬ì¡°ë¥Œ ê°ì§ê³ ìë€. ìŽ ìŽì€ì ìž êµ¬ì¡°ë ëì 첎ì ëŒë ì ìœ ììì ë§ë€ìŽì§ ë¯žêµ íµì ëµì êž°ì ì ìž íì륌 ë§ì¡±ìí€êž° ìíŽ êµ¬ìëìë€. ìŽë¬í êž°ì ì ìž íìë ìŽì€ì 컀뮀ëìŒìŽì
구조륌 ê°ë 컎íší° ë€ížìí¬ì ê°ë°ë¡ 충족ëììŒë©° ìŽ ê°ë°ê³Œì ì ì 볎Ʞì ìŽ ê°ì§ê³ ìë 묌늬ì ìì±ì ìíŽ ë€ì ìí¥ì ë°ìë€. ìŽ êžì 1950ë
ë ë°ìëì§ìí겜(SAGE: Semi-Automatic Ground Environment) ë공방ìŽì²Žê³ ê°ë° ì¬ë¡, 1960ë
ë ì륎íë·(ARPANET) ê°ë° ì¬ë¡ë¥Œ ë¶ìíì¬ ìŽì ê°ì ëì ì êµì 첎ì , 믞êµì ì ëµì íì, ì 볎Ʞì ì ìì±ìŽëŒë ìŒìì 구ì±ì ìž ìížìì©ìŽ ìží°ë·ì ìŽì€ì 컀뮀ëìŒìŽì
구조륌 ì°œì¶íë 곌ì ì ëë¬ëžë€.
1950ë
ë 믞ì ìêµì íµì ë ¥ ê· íì ê°ì¥ í° ìí¥ì ëŒì¹ ì¬ê±Žì 믞êµì 공격í ì ìë ìë šì íµí격 ë¥ë ¥ì íëìŽìë€. ìŽë¡ ìžíŽ ë¹ì ìë šì ì¬ëì 공격ì ëë¹íì¬ ëë볎복ì ëµì ì±ííê³ ìë 믞êµì ìŽë¥Œ 볎ìíêž° ìí ë공방ìŽì²Žê³ë¥Œ 걎ì€íê² ëë€. ë¹ì ì¡Žì¬íê³ ìë ëê³µë°©ìŽ ìì€í
ì ëê·ëªš ê³µìµì 첎ê³ì ìŒë¡ ëë¹í ì ìë íµí©ë ì 볎íµì 첎ê³ë¥Œ ê°ì¶ê³ ìì§ ëª»íê³ ìŽë¥Œ ê°ì íêž° ìíŽ SAGE ìì€í
ê°ë°ìŽ ì§íëìë€. SAGE ê°ë°ì 1950ë
ë ì§ì€ì ìž ì 볎Ʞì êŽëŠ¬êµ¬ì¡°ì ìí¥ ììì ì§íëìë€. ìŽ êŽëŠ¬êµ¬ì¡° ììì êµë°©ë¶ë 컎íší° ì°êµ¬ ìëì ëê·ëªšë¡ ëìíì¬ SAGEëŒë ë¶ë¯ž ëë¥ì ê±žì¹ ì»Žíší°ë€ì ë€ížìí¬ë¥Œ ìµìŽë¡ ê°ë°íë€. ë¹ìê¹ì§ 컎íší° ìì€í
ë€ì 몚ë ë
늜ì ìŒë¡ ìëë ë¿ ìë¡ ì°ê²°ëì§ ììë€. ìŽ íë¡ì ížë¡ ìµìŽì 컎íší°ë€ì ë€ížìí¬ê° ë§ë€ìŽì§ë€.
1957ë
ì€ížížëí¬íž ë°ì¬ì íšê» ìë šì ICBM ìíìŽëŒë êµì ì ì¹ì ìë¡ìŽ 구조ì ë³íê° ë°ìíë€. 믞êµì ë€ìêž íµì ëµì ìì í ìë°ì ììë€. ì ì°ë°ìì ëµìŒë¡ ì íí 믞êµì íµì ìì ìí ììì ë맹군ì í¬íší ì ìžê³ ê°ì§ì 믞군ì íµì í ì ìë ì§ííµì 첎ì 륌 걎ì€íê³ ì íë€. ìŽë¥Œ ìíŽ ìë¡ ë€ë¥ž 컎íší° ê°ì ížíì ê°ë¥íê² íë©° íµì ìì ìí© ìììë ìì¡Žê°ë¥í ìë¡ìŽ ë€ížìí¬ê° íìíë€. 1960ë
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늜ì ìž ì»Žíší° ì°ì
곌 ì°êµ¬ê° ì±ìí ìí© ììì SAGEì ê°ì ëê·ëªšì ëìì ë¶ê°ë¥íë€. íì§ë§ 믞êµì ê³ ë±ì°êµ¬ê³íêµ(ARPA: Advanced Research Projects Agency)ì ì 볎ì²ëŠ¬êž°ë²ë¶(IPTO: Information Processing Techniques Office)륌 íµíŽ ì°ì
첎ì ëíì ì°êµ¬ ìëì ì¡°ìšíšìŒë¡ì ìíë êž°ì ì íì륌 충족ìí¬ ì ììë€. ìŽë¬í ë¶ì°ê³Œ ì¡°ìšì ë³µí©ì ìž êŽëŠ¬êµ¬ì¡°ë¥Œ íµíŽì ARPANETìŽ íìíë€. ìŽê²ìŽ ë¶ì°ì ìí€í
ì³ë¥Œ ê°ì§ë©Žìë ì§ì€ì ìž êŽëŠ¬ë°©ìì ê°ë ì§êž ìží°ë·ì ììŽê° ëìë€.
ìŽ êžì ê²°ë¡ ììë ìží°ë·ì ìŽì€êµ¬ì¡°ìì êž°ìží íëì ìŽí ìë¡ìŽ ê¶ë ¥ì ììì ì§ìŽë³žë€. ëì ì ê±°ì³ êµ¬ì±ë ìží°ë· ìŽë©Žì ì¡Žì¬íë ì§ì€ì íµì ë°©ìì ëë¬ëì§ ìë ê³³ìì ìŽë¥Œ 죌ëíë 믞êµìê² ë§ì ìŽì ì ê°ì žìë€. ìží°ë·ì íë¡í ìœê³Œ êž°ì êŽëŠ¬ì²Žê³ë¥Œ ë
ì íšìŒë¡ì 믞êµì íëì ìŽí ì¬ìŽë² ê³µê°ìì íšê¶ì ì§ì륌 ë늎 ì ììë€. ë ëìê° ìží°ë·ì ìŽì€êµ¬ì¡°ë ì€ëë ì§êµ¬ì ê¶ë ¥ì 볞ì§ì ë³íì ìŒêž°íê³ ìë€.â
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2. êž°ì¡Žì°êµ¬ ê²í
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¢. ìë šì íµê°ë°ê³Œ SAGEì 걎ì€
1. ìë šì íµê°ë°ê³Œ ë공방ìŽê³í
2. 1950ë
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£. ìë šì ICBM ê°ë°ê³Œ ARPANETì 걎ì€
1. ìë šì ìµì§ë¥ë ¥ í¥ì곌 ì ì°ë°ìì ëµì ì±í
2. 1960ë
ë ë³µí©ì ì 볎Ʞì êŽëŠ¬êµ¬ì¡°
3. ARPANET ê°ë°ì 곌ì
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ì°žê³ ë¬žíMaste
OFDM ì±ë ì¶ì ì ìí íìŒë¿ íšíŽ ì€ê³
Thesis (master`s)--ììžëíêµ ëíì :ì Ʞ·컎íší°ê³µíë¶,2003.Maste
The Cold War and the Communication Structure of the Internet-the Constitution of IT through International Politics
ì£Œë¥ êµì ì ì¹ìŽë¡ ë€ìì ìžì¬ì ìž ë
늜ë³ìë¡ë§ ì·šêžëìŽ ìë ì 볎Ʞì 첎ê³ê° êµì ì ì¹ì ìŒë¡ 구ì±ëë 몚ìµì ìŽ êžì ì¶ì íë€. í¹í ì€ëì ìží°ë·ìŽ ê°ì§ê³ ìë ìŽì€ì ìž ì»€ë®€ëìŒìŽì
êµ¬ì¡°ê° ë§ë€ìŽì§ êµì ì ì¹ì ìž ê³Œì ì 죌목íë€. ìží°ë·ì ë§€ì° ë¶ì°ì ìž ì»€ë®€ëìŒìŽì
겜ë¡ì ìŽë¥Œ êŽëŠ¬íë íë¡í ìœìŽëŒë ì§ì€ì êŽëŠ¬ë°©ììŽ ê²°í©ë ìŽì€ì ìž ì»€ë®€ëìŒìŽì
구조륌 ê°ì§ê³ ìë€. ìŽ ìŽì€ì ìž êµ¬ì¡°ë ëì 첎ì ëŒë ì ìœ ììì ë§ë€ìŽì§ ë¯žêµ íµì ëµì êž°ì ì ìž íì륌 ë§ì¡±ìí€êž° ìíŽ êµ¬ìëìë€. ìŽë¬í êž°ì ì ìž íìë ìŽì€ì 컀뮀ëìŒìŽì
구조륌 ê°ë 컎íší° ë€ížìí¬ì ê°ë°ë¡ 충족ëììŒë©° ëìì ìŽ ê°ë°ê³Œì ì ì 볎Ʞì ìŽ ê°ì§ê³ ìë 묌늬ì ìì±ì ìíŽ ë€ì ìí¥ì ë°ìë€. ìŽ êžì 1950ë
ë ë°ìëì§ìí겜(SAGE: Semi-Automatic Ground Environment) ë공방ìŽì²Žê³ ê°ë° ì¬ë¡, 1960ë
ë ARPANET ê°ë° ì¬ë¡ë¥Œ ë¶ìíì¬ ìŽì ê°ì ëì ì êµì 첎ì , 믞êµì ì ëµì íì, ì 볎Ʞì ì ìì±ìŽëŒë ìŒìì 구ì±ì ìž ìížìì©ìŽ ìží°ë·ì ìŽì€ì 컀뮀ëìŒìŽì
구조륌 ì°œì¶íë 곌ì ì ë¶ìíë€.For many years, scholars of International Relations have paid much attention to the effect of Information Technology to world politics. However, few explored how international political processes have influenced the formation of IT. This paper tries to fill this gap by examining the Cold War origin of the communication structure of the Internet. Contrary to the popular myth of the inherent liberal characteristics of the Internet, its structure has both decentralizing and centralizing effects. On the one hand, the Internet has decentralizing architecture that promotes free communication among individuals. On the other hand, this decentralized communication is governed by the centralized control of protocols. This double structure of the Internet communication was developed to fulfill technological needs of the nuclear strategy of the U.S. during the Cold War, and its developmental process, in turn, was affected by the inherent characteristics of IT. This paper shows how the constitutive relationship of the Cold War international system, the nuclear strategy of the U.S. and material features of IT gave birth to the unique structure of the Internet through the studies of two critical junctures of its development: Semi-Automatic Ground Environment project in 1950s and ARPANET in 1960s
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